Lapping machine



A. E. ROBINSON 1,878,603

LAPPING MACHINE Sept. 20, 1932.

Filed April 15, 1931 5 Sheets-Sheet. 1

gggj'im Sept. 20, 1932.

A. E. ROBlNSON LAPPING MACHINE Filed April 13, 1951 5 Sheets-Sheet nvmswmg;

for lapping gears in mesh Patented Sept. 20, 1932 UITED STATES Pas- ALBERT E. ROBINSON,

WORKS COMPANY, or CINCINNATI, OHIO, A CORPORATION or OHIO LAPIPING MAGI-IIN E Application filed April 13, 1931.

Serial No. 529,736.

partly broken away.

he present invention is an the invention shown, described and claimed in my copending application for patent on improvements in lapping machines, filed in the United States Patent Oifice April 13, 1931, as Serial No. 529,735.

has a motor 12 mounted thereelaboration of gears; and, further, to provide novel means for applying resistance to being lapped in order to supply lapping pres sure between said gears. 1

he invention will be further readily understood from the following description and claims, and from the drawings, in which latter:

Fig. 1 is a front elevation of my improved device.

Fig. 2 broken away, showing a spindle supporting a plurality of bushings and gears, and partly roken away.

Fig. 3 is a cross-section of the same, taken on the line 33 of Fig. 1, and partly broken away.

Fig. 4 is a vertical sectional detail view of the same, taken on the line H of Fig. 10, and partly broken away.

ig. 5 is a vertical section of the same,

I taken on the line 5-5 of Fig. 10, and partly roken away.

Fig. 6 is a side view of my improved device, partly broken away.

ig. 7 is a cross-sectonal detail View, taken in the plane of the line 7-7 of Fig. 6, and partly broken away.

Fig. 8 is a vertical section of my improved device, taken on the line 8+8 of Fig. 10, partly broken away, and showing a number of spur gears.

Fig. 9 is a vertical section of myimproved device, taken on theline 99 of Fig. 2, and partly broken away; and,

is a plan view of the same, partly th ed on a bracket of the arbor 16 rotatable therein.

is arbor comprises a sleeve 17 in which there is a bore 18 an a tapered socket 19 at one end of the bore. 8.) A spindle 21 has a threaded end 28 screwing into the ta- The parts are clamped together endwise for Y securing the spindle in the sleeve.

The arbor is rotatable in ball bearings 31, 32, in the housing. It forms the driving arbor of the device.

- The driving arbor has a pulley 33 thereon. (Figs. 2, 6, 8 and 10.) A pulley 34 is on the rotor shaft. A belt 35 is received about the pulleys for driving the arbor 16 faces of the teeth of the gears being lapped.

he outer raceways of the ball bearings 31, 32, are located in rabbets 3?, 38, of the housing. A cap 39, is fixed to the end of said housing as by bolts 11. (Fig. 8.) The inner raceways of said ball bearings are spaced apart by acollar 43, one of said inner raceways being positioned by a shoulder 44 on said sleeve. 3

33 has a hub 45 received about the opposite end of the sleeve, a nut being threaded over the threaded end of the sleeve for clamping the hub, the inner raceways and the collar therebetween upon sai shoulder. A lubricant shield 47is receive about the opposite end of the sleeve and suitably held in place.

The gear on the driving arbor is shownas a bevel gear 51 in Figs. 1, 2, 6 and 9, and as a spur-gear 52 in Figs. 8 and 10. A number of gears can The driven pulley be located side by side on any of the arbors, depending on the lengths of the 98 rotatable in an annular bearing 99 on the receiving shanks of the spindles, and having holes of various diameters may be centrally mounted on the arbors by providing bushing structures of various diameters or providing spindles having gear receiving shanks of various diameters. J

.Fig. 8 shows a plurality of such bushing structures and gears to be lapped secured to one of the arbors.

The spindle 21 is provided with a flange 55 forming a shoulder for a bushing 56 rotatably connected with the spindle by means of a key 57, the gear to be lapped being received about the bushing and being rotatively connected therewith by a key58. (Figs. 8 and 9.) The bushing has a flange 59 serving as an end stop for the gear. Spindles having shanks of different lengths may be employed. (Compare Figs. 8 and 9.

A plurality of such bushin structures may be located end to end on t e spindle, and any excess in length of the gear shank of the spindle may be filled with filling collars 62. A washer 63 is received about the reduced end 64 of the spindle, a. nut 65 having threaded connection d for clampin the parts together endwise.

2D for mounting the gears having ferent diameters herein shown and described are not herein claimed, the same having been shown, described and claimed in my aforesaid copending application. v

The frame is provided withguides' 71 on which a saddle 72 is adjustable toward and from the arbor 16 in a path parallel with said arbor. (Figs. 1, 2, 6, 7' and 10.) The adjustment is accomplished by means of a threaded rod 73 having threaded connection with a nut 74 secured to the saddle by a bolt The screw rod has a handle 76 thereon This forms a micrometer adjustment for the saddle on the frame. The saddle may be clamped in adjusted positions by a shoe 77 coacting with the guide and arranged to be clamped and unclamped by a nut 78.

Slides 81, 82, are adjustable on the saddle toward and from each other and toward and from the vertical plane in which the-arbor 16 is located. (Figs. 1,2, 3, 6, 9 and 10.) The saddle is provide with guides 83, along which the slides are adjustable. Screw rods gear gears 6 ings 86, 87,

d 91. fixed to said slides as by 84, 85, are rotatable and held endwise in bearat the respective ends of said saddle, handles 88, 89, being fixed to said screw rods for adjusting the same. spective slides are provided with nuts 90, means of bolts 92, 93. The screw rods are threaded into said nuts for adjusting the slides. This forms a micrometer adjustment for each 0 the slides for delicacy justments of the slides.

A swivel 97 is rotatable on the slide 81. (Figs. 1, 9 and 10). It has a journal stu and accuracy of a slide 81. T-bolts 100 have heads received in an annular T-slot 101 in said slide, nuts 102 threaded on the T-bolts clamping the swivel in adjusted positions.

A locking pin'105 is endwise shiftable in a guide 106, (Fig. 4), on the swivel an has a tapered locating end 107 received in tapered sockets 108, 109, in the slide 81 for locating the arbor on the swivel with its axis of rotation perpendicular to the axis of rotation of the arbor 16, as when lapping bevel gears, as exemplified in Figs. 1, 2 and 6, or parallel with said axis as when lapping spur gears, as exemplified in Fig. 10 by being provided with a rack 111 with which a pinion 112 meshes, the pinion being on a shar't7113 in a bearing 114 on the swivel and having a handle 115 for operating the same. A spring 116 between a shoulder 117 on said plunger and a plug 118 in the guide 106 and surrounding the shank of said plunger normally urges the plunger into its locating sockets.

The swivel 97 has a housing 121 thereon in which an arbor 122 is journaled. This ar- (Figs. 1, 3 and 9). Brake shoes 128 provided with brake linings 129 coact with the brake flange 130' of the brake hub 45'. The brake shoes are provided with slots 131 in 132 are received, these ins being fixed to the inner wall 133 of a shell 134, this inner wall also serving as part (if the cap covering the end of the housing The brake shoes are and have movements and from the brake shoe.

pivoted on said pins on said pins towar The locatingplunger 1S axially movable The brake shoes 7 dim are provided with contact bosses 135 at the ranged for lapping bevel gears, for instance respective sides of their pivots. Plungers three bevel gears of a set forming for instance 6 have heads 137 which coact with said the intermeshing bevel gears of the back gear osses for urging the brake shoes toward the or reversing mechanism for the drill spindle brake hub, theseplungers acting on the reof a radial drill. Fig. 10 shows the machine resilient friction urging means for the art e arbor 122 is arranged parallel with and at ifierences in contact between the teeth of n operation, rotation in a given direction t e gears being lappe s imparted to the arbor by operation ofthe hollow bolt 138 is adjustable in a rotor of the motor in one d rection. This threaded bearing 139 at the position of each causes rotation of the arbors 1n given direcof the plungers. The bolt has a. socket 140 tlons, depending on the meshing relations of in which the head of the plunger has movethe gears being lapped. The adjustments of ment, the plunger having a stem axially the slides are such that such meshing relamovable in a hole in the end wall of the tion between the gears being lapped is obsocket, a spring 141 being located in said tained' as to cause contact between the high socket and said end wallfor urging th points or most misshapen portionsofthe teeth plunger toward the brake shoe. (Fig. 3). thereof. As these high points are worn away set screw 142 threaded in the Wall of the during operation, the adjustable slides are threaded hole clamps the hollow bolt in adadjusted; toward he stationary arbor for justed positions, adjustment of the hollow causing approach between the gears being bolt adjusting the tension of the spring. The lapped. These adjustments are micrometer stem of the plunger is provided with a collar adjustments for accurate approach between 3 pinned thereto, forming a stop for' inthe gears,-and such approach is continued ward movement of the plunger. A closing either uninterruptedlv or step by step until plate 144 is bolted to the end of the shell and the teeth of the gears are in proper form and has a hole 145 for accommodating the outer have proper meshing relation.

end of the arbor. v otation ofthe driving arbor in one direc- The slide 82 has a housing 151 thereon simhon causes lapping of one of the sides of the ilar to the housing 121. (Figs. 1,2, 5 and 10.) teeth of each of the gears being lapped, Ro-

An EII'bOI 152 is journaled 111 housing. It tafion the driving arbor 1'1 the opposite comprisesasleeve 153 and a spindle 154. This direction causes engagementand lapping of arbor and its mounting are in all respects the opposite sides of theteethof therespecsimilar to the arbor 16 and its mounting, the tive gears. These chan es of direction'ma parts being designated by s1milar reference take place in steps durin the lapping, or the .1

numerals raised to the series 200. Suitable lapping of one ofthe sides of the teeth may gears of various sizes may be mounted on the be completed before the l pping of the other arbor 152, having similar mounting and atof the sides of said teeth is begun.

taching means as those provided for the gears .uring suchlap'ping resistance is imparted on t e arbor 16. 1g. 8.) A bevel gear is to the driven ar ors, causing pressure be- I1 shown mountedon the arbor 152 in Figs. 1 tween the races of the teeth being lapped-for and 2. This arbor is shown in Fig. 10 as expediting the lapping. This is-etiected by having its spindle and clamping rod removed, the braking means, and the frictional resistas in this View the machine is shown lapping ance of the braking means is adjustable for spur gears located on the arbors 16 and 122, adjusting the lapping pressure between the -1L the arbor 152 being shown idle. teeth. This frictional resistance is'preferably I T e hardening of the gears causes change of mg means for each end of each of the shoes,

Gears to be lapped usually have their teeth imparted by. plvotally mounted shoes at the cut or formed thereon and are then hardened. respective sides of 'a brake hub, and adjust form in the gears or of some or all of the -so that delicate ad ustment for each direction {.120 teeth, and the object of the lapping is to reof rotation of th gears may be had, for produce the teeth to their proper forms. viding a constant amount of resistance to roe lapping is performed by meshing the 'tation'of the gears being lapped, with consegears to be lapped together, and supplying quent even lappingo'f the teeth. a lapping compound, as a mixture of powy improved device presents compact dered carborundum or grease, either manualmeans for the lapping of meshing gears, and ly or automatica ly to the teeth, as by means simple and effective means. whereby the ma.- of a brush or a pipe feeding the compound to 0 inc may be changed for lapping bevel gears the gears to be lapped. and the like or spur gears and the like, pre= igs. 1, 2, 6 and 9 show the device arsents delicate pressure between the sides of 3. 3

the teeth of the gears, and is strong, durable 4.. In a gear lapping machine, the combiand simple in construction. nation of a frame, a housing thereon, a shaft Having thus fully described-my invention, journaled on said housing, a saddle, means what I claim as new, and desire to secure by for adjusting the distance between said hous- Letters Patent, is: ing and said saddle, a pair of housings on said 1. In a gear lapping machine, the combinasaddle at the respective sides of the axis extion of a frame, a housing thereon, a shaft tended of said shaft, means for adjusting the journaled on said housing, a saddle, a pair of distance between said housings, a shaft our- .housings on said saddle at the respective sides naled on each of said pair of housings'and of the axis extended of said shaft, means for having axes of rotation which are normally f adjusting the respective housings of said pair in line with each other and at right angles to of housings toward and from said axis, means said first-named axis, means for rotating one for adjusting said saddle toward and from of said shafts,means on the proximate ends of said first-named housing for simultaneously said shafts for receiving meshing bevel gears Q adjusting said pair of housings toward and to be lapped, mounting means on one of said from said first-named housing, a shaft jourhousings. for one of said shafts, adjusting naled'on each of said pair of housings and means for. said mounting means whereby to having axes of rotation which are norma 1y arrange one of said shafts into vparallelism in line with each other and at right angles to and ofiset relation with another of said shafts Q said first-named axis, means on the proximate for receiving meshing spur gears to be lapped, 3 ends of said shafts for receiving meshing said shafts including driven shafts, and" adgears to be lapped, and means for rotating justable braking means for said driven shafts. one of said shafts. 5. Ina gear lapping machine, the'combi- 2. In a gear lapping'machine, the combination of a frame, a housing thereon, a driv- Ci nation of a frame, a housing thereon, a shaft ing arbor on said housing, a saddle, means journaled on said housing, a saddle, means for adjusting said saddle on said frame tofor adjusting the distance betweensaid housward and from said'housing, a housing at ing and said saddle, a pairof housings on said each end of said saddle respectively locate saddle at the respective sides ofthe axis .exlaterallyin opposite directions with rela- Ego tended of said shaft, means for adjusting the tion to saidfirst-named housing, an arbor on distance between said housings, a shaft joureach of said last-named housings, means for naled on each of said pair of ho sings n shiftingly-and'swivelingly adjusting one of having axes of rotation which are normally said last-named housings with relation to' the in line with each other and at right angles t others of said housings, whereby to arrange GT3]; said first-named axis, means for rotating one said last-narned arbors in alignment, andarof said shafts, means on the proximate ends of ra gin aid bor on said swiv lingly, adsaid shafts for receiving meshing.beV 1'g justable housing parallel with and offset from to be lapped, moun ing m n f r e f d said driving arbor, whereby to'arrange said housings, and POSitiOIllIlg means 01 said one embers for lapp ng meshing bevel gears an 27 of said housings whereby to arrange the shaft l i hi spur gears d means t. th thereon. into parallelism and ofiset relation proximate d of id arbors f i g another Of said for receiving meshing gears to be lapped meshmg P gears, to be PP 6. In a gear lapping machine, the combina- In a gear lappmg f b thecombma' tion of a frame, a housing thereon, a driving '16 t of framez a housfmg thereon, a Shaft arbor on said housing arranged to be driven loumaled Smd housing, a means in reverse directions, guideways on sai for ad usting the distance between said housframe extending p a ran 61 with Said (arbor, a saddle on said guideways, micrometer means ing and said saddle, a pair of housings on said saddle at the respective sides of the axis f d (M t d d f 1- extended of said shaft, means for ad usting f im Sim l r a 1.10m

the distance between said housings, a shaft housing, housmgron i 16 a o e journaled on each of said pair of housings slde 9i Smd Y a an arbor be onp and having axes of rotation which are nor- Fi to 531d e y guldeways 011 many in line with each other and at right i d e p p ndicularto sa first-named '5 angles to said first-named axis, means for rog Y and the other l 9 S tating one of said shafts, means on the proxisaid first-named gl11ClGWa yS, a slide on said mate ends of said shafts for receiving meshsec nd-n med g iideways, m crometermeans ing bevel gears to be lapped, mounting for adjusting said slide on said second-named means on one of said housings for one of said guideways oward and from said secondto shafts and swiveling means for swiveling said named housing, a swivel on said slide, athird mounting means whereby to arrange one of housing on said swivel, a third arbor thereon, said shafts into parallelism and offset relameans for adjusting said swivel on said slide tion with one of the shafts normally at right for adjusting the. arbor thereon into paralangles thereto for receiving meshing spur lelism with said first-named arbor and said 65 gears to be lapped. second-named arbor, and means at the nner arbor with relation to said first-named arbor,

the respective ends of said housing, a housing side of said guideways, an arbor thereon perpendicular to said guideways, guideways on said saddle perpendicular to said first-named guideways and extending to the other said first-named guldeways, a. slide on said on said saddle at one rom said secondhouslng, a swlvel on sa1d slide, a thlrd housing on sa1d swivel, a third arbor for adjusting the arbor thereon into parallelism With said first-named ond-named arbor, means at the inner ends of said arbors for attaching meshing gears to be lapped and adjustable braking means for said second-named arbor and said thirdnamed arbor.

8. In a gear lapping machine, the combinatlon of a housing, an arbor thereon, means for rotating said arbor in reverse directions, an additional housing, an arbor thereon, means on the proximate ends of said arbors for securing meshing gears to be lapped, a brake hub on said second-named arbor, brake shoes about said brake hub, shoes, pivot connectlons between portions of said spring respective sides of said pivot connections, and means for adjustin the pressures of said spring pressed d arranged for causing lapping contacts of both sides of the teeth of said meshing gears and for adjusting the pressures of said lapping contacts.

11 a. gear lapping machine, the combination of a housing, an arbor thereon, means for rotating said arbor in reverse directions, a slide, means for adjusting said slide toward and from said arbor, a swivel on said slide, a housing thereon, an arb means for adjusting said for adjusting the angle of said second-named an enlargement about said brake-hub, brake shoes in said enlargement, pivot connections between the middle portions of said brake shoes and said named housing, spring pressed plungers for said brake shoes at the the lapping contacts upon both sides of the teeth of said meshing In testimony whereof, I have hereunto signed my name.

ALBERT E. ROBINSON. 

